Home / 100,012.46-138,030.16-57,007.40

Finding the Fourth Proportional to 100,012.46, 138,030.16 and 57,007.40

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Solution

The fourth proportional to 100,012.46, 138,030.16 and 57,007.40 is: 78,677.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,012.46 : 138,030.16 = 57,007.40 : x
  2. Step 2: Convert to fraction form
    100,012.46/138,030.16 = 57,007.40/x
  3. Step 3: Cross multiply
    100,012.46x = 138,030.16 × 57,007.40
  4. Step 4: Simplify right side
    100,012.46x = 7,868,739,817.40
  5. Step 5: Solve for x
    x = 7,868,739,817.40/100,012.46
  6. Step 6: Final answer
    x = 78,677.60

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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.