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Finding the Fourth Proportional to 865,999.40, 1,298,999.10 and 492,751.40

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Solution

The fourth proportional to 865,999.40, 1,298,999.10 and 492,751.40 is: 739,127.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    865,999.40 : 1,298,999.10 = 492,751.40 : x
  2. Step 2: Convert to fraction form
    865,999.40/1,298,999.10 = 492,751.40/x
  3. Step 3: Cross multiply
    865,999.40x = 1,298,999.10 × 492,751.40
  4. Step 4: Simplify right side
    865,999.40x = 640,083,625,123.74
  5. Step 5: Solve for x
    x = 640,083,625,123.74/865,999.40
  6. Step 6: Final answer
    x = 739,127.10

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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.