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Finding the Fourth Proportional to 439,816.80, 658,947.60 and 390,050.40

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Solution

The fourth proportional to 439,816.80, 658,947.60 and 390,050.40 is: 584,385.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    439,816.80 : 658,947.60 = 390,050.40 : x
  2. Step 2: Convert to fraction form
    439,816.80/658,947.60 = 390,050.40/x
  3. Step 3: Cross multiply
    439,816.80x = 658,947.60 × 390,050.40
  4. Step 4: Simplify right side
    439,816.80x = 257,022,774,959.04
  5. Step 5: Solve for x
    x = 257,022,774,959.04/439,816.80
  6. Step 6: Final answer
    x = 584,385.99

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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.