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Finding the Fourth Proportional to 865.77, 1,298.44 and 345.66

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Solution

The fourth proportional to 865.77, 1,298.44 and 345.66 is: 518.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.77 : 1,298.44 = 345.66 : x
  2. Step 2: Convert to fraction form
    865.77/1,298.44 = 345.66/x
  3. Step 3: Cross multiply
    865.77x = 1,298.44 × 345.66
  4. Step 4: Simplify right side
    865.77x = 448,818.77
  5. Step 5: Solve for x
    x = 448,818.77/865.77
  6. Step 6: Final answer
    x = 518.40

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Double scale
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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.