Home / 78,759.36-118,064.40-31,403.76

Finding the Fourth Proportional to 78,759.36, 118,064.40 and 31,403.76

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Solution

The fourth proportional to 78,759.36, 118,064.40 and 31,403.76 is: 47,075.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,759.36 : 118,064.40 = 31,403.76 : x
  2. Step 2: Convert to fraction form
    78,759.36/118,064.40 = 31,403.76/x
  3. Step 3: Cross multiply
    78,759.36x = 118,064.40 × 31,403.76
  4. Step 4: Simplify right side
    78,759.36x = 3,707,666,082.14
  5. Step 5: Solve for x
    x = 3,707,666,082.14/78,759.36
  6. Step 6: Final answer
    x = 47,075.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.