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Finding the Fourth Proportional to 390,851.20, 586,276.80 and 95,363.20

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Solution

The fourth proportional to 390,851.20, 586,276.80 and 95,363.20 is: 143,044.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,851.20 : 586,276.80 = 95,363.20 : x
  2. Step 2: Convert to fraction form
    390,851.20/586,276.80 = 95,363.20/x
  3. Step 3: Cross multiply
    390,851.20x = 586,276.80 × 95,363.20
  4. Step 4: Simplify right side
    390,851.20x = 55,909,231,733.76
  5. Step 5: Solve for x
    x = 55,909,231,733.76/390,851.20
  6. Step 6: Final answer
    x = 143,044.80

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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.