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Finding the Fourth Proportional to 390,928.80, 586,587.60 and 154,279.20

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Solution

The fourth proportional to 390,928.80, 586,587.60 and 154,279.20 is: 231,495.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,928.80 : 586,587.60 = 154,279.20 : x
  2. Step 2: Convert to fraction form
    390,928.80/586,587.60 = 154,279.20/x
  3. Step 3: Cross multiply
    390,928.80x = 586,587.60 × 154,279.20
  4. Step 4: Simplify right side
    390,928.80x = 90,498,265,657.92
  5. Step 5: Solve for x
    x = 90,498,265,657.92/390,928.80
  6. Step 6: Final answer
    x = 231,495.52

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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.