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Finding the Fourth Proportional to 390,648.60, 586,005.30 and 124,401.60

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Solution

The fourth proportional to 390,648.60, 586,005.30 and 124,401.60 is: 186,612.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,648.60 : 586,005.30 = 124,401.60 : x
  2. Step 2: Convert to fraction form
    390,648.60/586,005.30 = 124,401.60/x
  3. Step 3: Cross multiply
    390,648.60x = 586,005.30 × 124,401.60
  4. Step 4: Simplify right side
    390,648.60x = 72,899,996,928.48
  5. Step 5: Solve for x
    x = 72,899,996,928.48/390,648.60
  6. Step 6: Final answer
    x = 186,612.72

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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.