Home / 100,068.10-138,075.80-57,045.76

Finding the Fourth Proportional to 100,068.10, 138,075.80 and 57,045.76

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Solution

The fourth proportional to 100,068.10, 138,075.80 and 57,045.76 is: 78,712.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,068.10 : 138,075.80 = 57,045.76 : x
  2. Step 2: Convert to fraction form
    100,068.10/138,075.80 = 57,045.76/x
  3. Step 3: Cross multiply
    100,068.10x = 138,075.80 × 57,045.76
  4. Step 4: Simplify right side
    100,068.10x = 7,876,638,948.61
  5. Step 5: Solve for x
    x = 7,876,638,948.61/100,068.10
  6. Step 6: Final answer
    x = 78,712.79

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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.