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Finding the Fourth Proportional to 388,998.80, 583,498.20 and 318,957.20

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Solution

The fourth proportional to 388,998.80, 583,498.20 and 318,957.20 is: 478,435.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,998.80 : 583,498.20 = 318,957.20 : x
  2. Step 2: Convert to fraction form
    388,998.80/583,498.20 = 318,957.20/x
  3. Step 3: Cross multiply
    388,998.80x = 583,498.20 × 318,957.20
  4. Step 4: Simplify right side
    388,998.80x = 186,110,952,077.04
  5. Step 5: Solve for x
    x = 186,110,952,077.04/388,998.80
  6. Step 6: Final answer
    x = 478,435.80

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Similar ratio
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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.