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Finding the Fourth Proportional to 261,613.80, 392,420.70 and 128,579.40

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Solution

The fourth proportional to 261,613.80, 392,420.70 and 128,579.40 is: 192,869.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,613.80 : 392,420.70 = 128,579.40 : x
  2. Step 2: Convert to fraction form
    261,613.80/392,420.70 = 128,579.40/x
  3. Step 3: Cross multiply
    261,613.80x = 392,420.70 × 128,579.40
  4. Step 4: Simplify right side
    261,613.80x = 50,457,218,153.58
  5. Step 5: Solve for x
    x = 50,457,218,153.58/261,613.80
  6. Step 6: Final answer
    x = 192,869.10

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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.