Home / 261,391,976.12-392,130,555.05-77,178,073.72

Finding the Fourth Proportional to 261,391,976.12, 392,130,555.05 and 77,178,073.72

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Solution

The fourth proportional to 261,391,976.12, 392,130,555.05 and 77,178,073.72 is: 115,779,685.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,391,976.12 : 392,130,555.05 = 77,178,073.72 : x
  2. Step 2: Convert to fraction form
    261,391,976.12/392,130,555.05 = 77,178,073.72/x
  3. Step 3: Cross multiply
    261,391,976.12x = 392,130,555.05 × 77,178,073.72
  4. Step 4: Simplify right side
    261,391,976.12x = 30,263,880,885,513,420
  5. Step 5: Solve for x
    x = 30,263,880,885,513,420/261,391,976.12
  6. Step 6: Final answer
    x = 115,779,685.88

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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.