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Finding the Fourth Proportional to 261,429.30, 392,403.15 and 128,459.70

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Solution

The fourth proportional to 261,429.30, 392,403.15 and 128,459.70 is: 192,816.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,429.30 : 392,403.15 = 128,459.70 : x
  2. Step 2: Convert to fraction form
    261,429.30/392,403.15 = 128,459.70/x
  3. Step 3: Cross multiply
    261,429.30x = 392,403.15 × 128,459.70
  4. Step 4: Simplify right side
    261,429.30x = 50,407,990,928.06
  5. Step 5: Solve for x
    x = 50,407,990,928.06/261,429.30
  6. Step 6: Final answer
    x = 192,816.91

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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.