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Finding the Fourth Proportional to 64,970.78, 89,644.47 and 38,111.90

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Solution

The fourth proportional to 64,970.78, 89,644.47 and 38,111.90 is: 52,585.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,970.78 : 89,644.47 = 38,111.90 : x
  2. Step 2: Convert to fraction form
    64,970.78/89,644.47 = 38,111.90/x
  3. Step 3: Cross multiply
    64,970.78x = 89,644.47 × 38,111.90
  4. Step 4: Simplify right side
    64,970.78x = 3,416,521,076.19
  5. Step 5: Solve for x
    x = 3,416,521,076.19/64,970.78
  6. Step 6: Final answer
    x = 52,585.50

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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.