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Finding the Fourth Proportional to 390,643.77, 539,099.78 and 220,874.25

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Solution

The fourth proportional to 390,643.77, 539,099.78 and 220,874.25 is: 304,812.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,643.77 : 539,099.78 = 220,874.25 : x
  2. Step 2: Convert to fraction form
    390,643.77/539,099.78 = 220,874.25/x
  3. Step 3: Cross multiply
    390,643.77x = 539,099.78 × 220,874.25
  4. Step 4: Simplify right side
    390,643.77x = 119,073,258,478.29
  5. Step 5: Solve for x
    x = 119,073,258,478.29/390,643.77
  6. Step 6: Final answer
    x = 304,812.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.