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Finding the Fourth Proportional to 478,429.20, 717,643.80 and 399,697.20

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Solution

The fourth proportional to 478,429.20, 717,643.80 and 399,697.20 is: 599,545.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,429.20 : 717,643.80 = 399,697.20 : x
  2. Step 2: Convert to fraction form
    478,429.20/717,643.80 = 399,697.20/x
  3. Step 3: Cross multiply
    478,429.20x = 717,643.80 × 399,697.20
  4. Step 4: Simplify right side
    478,429.20x = 286,840,217,457.36
  5. Step 5: Solve for x
    x = 286,840,217,457.36/478,429.20
  6. Step 6: Final answer
    x = 599,545.80

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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.