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Finding the Fourth Proportional to 499,681.28, 689,366.40 and 318,360.80

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Solution

The fourth proportional to 499,681.28, 689,366.40 and 318,360.80 is: 439,214.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    499,681.28 : 689,366.40 = 318,360.80 : x
  2. Step 2: Convert to fraction form
    499,681.28/689,366.40 = 318,360.80/x
  3. Step 3: Cross multiply
    499,681.28x = 689,366.40 × 318,360.80
  4. Step 4: Simplify right side
    499,681.28x = 219,467,238,597.12
  5. Step 5: Solve for x
    x = 219,467,238,597.12/499,681.28
  6. Step 6: Final answer
    x = 439,214.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.