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Finding the Fourth Proportional to 131,044, 180,840.80 and 71,428

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Solution

The fourth proportional to 131,044, 180,840.80 and 71,428 is: 98,570.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,044 : 180,840.80 = 71,428 : x
  2. Step 2: Convert to fraction form
    131,044/180,840.80 = 71,428/x
  3. Step 3: Cross multiply
    131,044x = 180,840.80 × 71,428
  4. Step 4: Simplify right side
    131,044x = 12,917,096,662.40
  5. Step 5: Solve for x
    x = 12,917,096,662.40/131,044
  6. Step 6: Final answer
    x = 98,570.68

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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.