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Finding the Fourth Proportional to 390,695.20, 586,042.80 and 141,344.80

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Solution

The fourth proportional to 390,695.20, 586,042.80 and 141,344.80 is: 212,017.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,695.20 : 586,042.80 = 141,344.80 : x
  2. Step 2: Convert to fraction form
    390,695.20/586,042.80 = 141,344.80/x
  3. Step 3: Cross multiply
    390,695.20x = 586,042.80 × 141,344.80
  4. Step 4: Simplify right side
    390,695.20x = 82,834,102,357.44
  5. Step 5: Solve for x
    x = 82,834,102,357.44/390,695.20
  6. Step 6: Final answer
    x = 212,017.20

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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.