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Finding the Fourth Proportional to 390,975.34, 539,385.60 and 237,890.80

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Solution

The fourth proportional to 390,975.34, 539,385.60 and 237,890.80 is: 328,191.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,975.34 : 539,385.60 = 237,890.80 : x
  2. Step 2: Convert to fraction form
    390,975.34/539,385.60 = 237,890.80/x
  3. Step 3: Cross multiply
    390,975.34x = 539,385.60 × 237,890.80
  4. Step 4: Simplify right side
    390,975.34x = 128,314,871,892.48
  5. Step 5: Solve for x
    x = 128,314,871,892.48/390,975.34
  6. Step 6: Final answer
    x = 328,191.73

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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.