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Finding the Fourth Proportional to 390,683.52, 539,079.36 and 256,713.60

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Solution

The fourth proportional to 390,683.52, 539,079.36 and 256,713.60 is: 354,222.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,683.52 : 539,079.36 = 256,713.60 : x
  2. Step 2: Convert to fraction form
    390,683.52/539,079.36 = 256,713.60/x
  3. Step 3: Cross multiply
    390,683.52x = 539,079.36 × 256,713.60
  4. Step 4: Simplify right side
    390,683.52x = 138,389,003,191.30
  5. Step 5: Solve for x
    x = 138,389,003,191.30/390,683.52
  6. Step 6: Final answer
    x = 354,222.78

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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.