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Finding the Fourth Proportional to 390,915.40, 586,373.10 and 124,695.40

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Solution

The fourth proportional to 390,915.40, 586,373.10 and 124,695.40 is: 187,043.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,915.40 : 586,373.10 = 124,695.40 : x
  2. Step 2: Convert to fraction form
    390,915.40/586,373.10 = 124,695.40/x
  3. Step 3: Cross multiply
    390,915.40x = 586,373.10 × 124,695.40
  4. Step 4: Simplify right side
    390,915.40x = 73,118,028,253.74
  5. Step 5: Solve for x
    x = 73,118,028,253.74/390,915.40
  6. Step 6: Final answer
    x = 187,043.10

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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.