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Finding the Fourth Proportional to 390,838.80, 586,258.20 and 257,869.20

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Solution

The fourth proportional to 390,838.80, 586,258.20 and 257,869.20 is: 386,803.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,838.80 : 586,258.20 = 257,869.20 : x
  2. Step 2: Convert to fraction form
    390,838.80/586,258.20 = 257,869.20/x
  3. Step 3: Cross multiply
    390,838.80x = 586,258.20 × 257,869.20
  4. Step 4: Simplify right side
    390,838.80x = 151,177,933,027.44
  5. Step 5: Solve for x
    x = 151,177,933,027.44/390,838.80
  6. Step 6: Final answer
    x = 386,803.80

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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.