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Finding the Fourth Proportional to 100,688.48, 138,946.48 and 55,366.08

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Solution

The fourth proportional to 100,688.48, 138,946.48 and 55,366.08 is: 76,403.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,688.48 : 138,946.48 = 55,366.08 : x
  2. Step 2: Convert to fraction form
    100,688.48/138,946.48 = 55,366.08/x
  3. Step 3: Cross multiply
    100,688.48x = 138,946.48 × 55,366.08
  4. Step 4: Simplify right side
    100,688.48x = 7,692,921,927.40
  5. Step 5: Solve for x
    x = 7,692,921,927.40/100,688.48
  6. Step 6: Final answer
    x = 76,403.20

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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.