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Finding the Fourth Proportional to 478,641.60, 717,962.40 and 320,011.20

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Solution

The fourth proportional to 478,641.60, 717,962.40 and 320,011.20 is: 480,016.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,641.60 : 717,962.40 = 320,011.20 : x
  2. Step 2: Convert to fraction form
    478,641.60/717,962.40 = 320,011.20/x
  3. Step 3: Cross multiply
    478,641.60x = 717,962.40 × 320,011.20
  4. Step 4: Simplify right side
    478,641.60x = 229,756,009,178.88
  5. Step 5: Solve for x
    x = 229,756,009,178.88/478,641.60
  6. Step 6: Final answer
    x = 480,016.80

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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.