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Finding the Fourth Proportional to 865,998.90, 1,298,998.35 and 492,750.90

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Solution

The fourth proportional to 865,998.90, 1,298,998.35 and 492,750.90 is: 739,126.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    865,998.90 : 1,298,998.35 = 492,750.90 : x
  2. Step 2: Convert to fraction form
    865,998.90/1,298,998.35 = 492,750.90/x
  3. Step 3: Cross multiply
    865,998.90x = 1,298,998.35 × 492,750.90
  4. Step 4: Simplify right side
    865,998.90x = 640,082,606,061.02
  5. Step 5: Solve for x
    x = 640,082,606,061.02/865,998.90
  6. Step 6: Final answer
    x = 739,126.35

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.