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Finding the Fourth Proportional to 261,639.40, 392,459.10 and 156,663.40

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Solution

The fourth proportional to 261,639.40, 392,459.10 and 156,663.40 is: 234,995.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,639.40 : 392,459.10 = 156,663.40 : x
  2. Step 2: Convert to fraction form
    261,639.40/392,459.10 = 156,663.40/x
  3. Step 3: Cross multiply
    261,639.40x = 392,459.10 × 156,663.40
  4. Step 4: Simplify right side
    261,639.40x = 61,483,976,966.94
  5. Step 5: Solve for x
    x = 61,483,976,966.94/261,639.40
  6. Step 6: Final answer
    x = 234,995.10

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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.