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Finding the Fourth Proportional to 99,120, 136,802.88 and 56,680.32

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Solution

The fourth proportional to 99,120, 136,802.88 and 56,680.32 is: 78,228.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,120 : 136,802.88 = 56,680.32 : x
  2. Step 2: Convert to fraction form
    99,120/136,802.88 = 56,680.32/x
  3. Step 3: Cross multiply
    99,120x = 136,802.88 × 56,680.32
  4. Step 4: Simplify right side
    99,120x = 7,754,031,015.32
  5. Step 5: Solve for x
    x = 7,754,031,015.32/99,120
  6. Step 6: Final answer
    x = 78,228.72

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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.