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Finding the Fourth Proportional to 78,678.02, 108,541.15 and 53,175.11

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Solution

The fourth proportional to 78,678.02, 108,541.15 and 53,175.11 is: 73,358.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,678.02 : 108,541.15 = 53,175.11 : x
  2. Step 2: Convert to fraction form
    78,678.02/108,541.15 = 53,175.11/x
  3. Step 3: Cross multiply
    78,678.02x = 108,541.15 × 53,175.11
  4. Step 4: Simplify right side
    78,678.02x = 5,771,686,915.13
  5. Step 5: Solve for x
    x = 5,771,686,915.13/78,678.02
  6. Step 6: Final answer
    x = 73,358.31

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1.5x scale

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.