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Finding the Fourth Proportional to 478,868.80, 717,428.40 and 389,639.20

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Solution

The fourth proportional to 478,868.80, 717,428.40 and 389,639.20 is: 583,747.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,868.80 : 717,428.40 = 389,639.20 : x
  2. Step 2: Convert to fraction form
    478,868.80/717,428.40 = 389,639.20/x
  3. Step 3: Cross multiply
    478,868.80x = 717,428.40 × 389,639.20
  4. Step 4: Simplify right side
    478,868.80x = 279,538,227,833.28
  5. Step 5: Solve for x
    x = 279,538,227,833.28/478,868.80
  6. Step 6: Final answer
    x = 583,747.01

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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.