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Finding the Fourth Proportional to 478,672, 718,008 and 128,464

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Solution

The fourth proportional to 478,672, 718,008 and 128,464 is: 192,696

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,672 : 718,008 = 128,464 : x
  2. Step 2: Convert to fraction form
    478,672/718,008 = 128,464/x
  3. Step 3: Cross multiply
    478,672x = 718,008 × 128,464
  4. Step 4: Simplify right side
    478,672x = 92,238,179,712
  5. Step 5: Solve for x
    x = 92,238,179,712/478,672
  6. Step 6: Final answer
    x = 192,696

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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.