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Finding the Fourth Proportional to 108,672.64, 149,989.20 and 70,881.28

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Solution

The fourth proportional to 108,672.64, 149,989.20 and 70,881.28 is: 97,829.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,672.64 : 149,989.20 = 70,881.28 : x
  2. Step 2: Convert to fraction form
    108,672.64/149,989.20 = 70,881.28/x
  3. Step 3: Cross multiply
    108,672.64x = 149,989.20 × 70,881.28
  4. Step 4: Simplify right side
    108,672.64x = 10,631,426,482.18
  5. Step 5: Solve for x
    x = 10,631,426,482.18/108,672.64
  6. Step 6: Final answer
    x = 97,829.84

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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.