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Finding the Fourth Proportional to 918,518.02, 1,378,404 and 319,473.20

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Solution

The fourth proportional to 918,518.02, 1,378,404 and 319,473.20 is: 479,427.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    918,518.02 : 1,378,404 = 319,473.20 : x
  2. Step 2: Convert to fraction form
    918,518.02/1,378,404 = 319,473.20/x
  3. Step 3: Cross multiply
    918,518.02x = 1,378,404 × 319,473.20
  4. Step 4: Simplify right side
    918,518.02x = 440,363,140,218.81
  5. Step 5: Solve for x
    x = 440,363,140,218.81/918,518.02
  6. Step 6: Final answer
    x = 479,427.87

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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.