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Finding the Fourth Proportional to 129,018.92, 178,045.98 and 72,430.40

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Solution

The fourth proportional to 129,018.92, 178,045.98 and 72,430.40 is: 99,953.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,018.92 : 178,045.98 = 72,430.40 : x
  2. Step 2: Convert to fraction form
    129,018.92/178,045.98 = 72,430.40/x
  3. Step 3: Cross multiply
    129,018.92x = 178,045.98 × 72,430.40
  4. Step 4: Simplify right side
    129,018.92x = 12,895,941,549.79
  5. Step 5: Solve for x
    x = 12,895,941,549.79/129,018.92
  6. Step 6: Final answer
    x = 99,953.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.