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Finding the Fourth Proportional to 390,171.08, 585,278.22 and 123,912.20

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Solution

The fourth proportional to 390,171.08, 585,278.22 and 123,912.20 is: 185,875.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,171.08 : 585,278.22 = 123,912.20 : x
  2. Step 2: Convert to fraction form
    390,171.08/585,278.22 = 123,912.20/x
  3. Step 3: Cross multiply
    390,171.08x = 585,278.22 × 123,912.20
  4. Step 4: Simplify right side
    390,171.08x = 72,523,111,852.28
  5. Step 5: Solve for x
    x = 72,523,111,852.28/390,171.08
  6. Step 6: Final answer
    x = 185,875.16

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1.5x scale

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.