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Finding the Fourth Proportional to 390,639.97, 539,123.34 and 237,689.29

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Solution

The fourth proportional to 390,639.97, 539,123.34 and 237,689.29 is: 328,035.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,639.97 : 539,123.34 = 237,689.29 : x
  2. Step 2: Convert to fraction form
    390,639.97/539,123.34 = 237,689.29/x
  3. Step 3: Cross multiply
    390,639.97x = 539,123.34 × 237,689.29
  4. Step 4: Simplify right side
    390,639.97x = 128,143,843,907.03
  5. Step 5: Solve for x
    x = 128,143,843,907.03/390,639.97
  6. Step 6: Final answer
    x = 328,035.67

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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.