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Finding the Fourth Proportional to 485,507.64, 728,261.46 and 319,256.76

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Solution

The fourth proportional to 485,507.64, 728,261.46 and 319,256.76 is: 478,885.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,507.64 : 728,261.46 = 319,256.76 : x
  2. Step 2: Convert to fraction form
    485,507.64/728,261.46 = 319,256.76/x
  3. Step 3: Cross multiply
    485,507.64x = 728,261.46 × 319,256.76
  4. Step 4: Simplify right side
    485,507.64x = 232,502,394,152.47
  5. Step 5: Solve for x
    x = 232,502,394,152.47/485,507.64
  6. Step 6: Final answer
    x = 478,885.14

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1.5x scale

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.