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Finding the Fourth Proportional to 73,145.60, 109,718.40 and 64,390.40

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Solution

The fourth proportional to 73,145.60, 109,718.40 and 64,390.40 is: 96,585.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,145.60 : 109,718.40 = 64,390.40 : x
  2. Step 2: Convert to fraction form
    73,145.60/109,718.40 = 64,390.40/x
  3. Step 3: Cross multiply
    73,145.60x = 109,718.40 × 64,390.40
  4. Step 4: Simplify right side
    73,145.60x = 7,064,811,663.36
  5. Step 5: Solve for x
    x = 7,064,811,663.36/73,145.60
  6. Step 6: Final answer
    x = 96,585.60

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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.