Home / 85,779.28-128,667.76-38,381.84

Finding the Fourth Proportional to 85,779.28, 128,667.76 and 38,381.84

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Solution

The fourth proportional to 85,779.28, 128,667.76 and 38,381.84 is: 57,572.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,779.28 : 128,667.76 = 38,381.84 : x
  2. Step 2: Convert to fraction form
    85,779.28/128,667.76 = 38,381.84/x
  3. Step 3: Cross multiply
    85,779.28x = 128,667.76 × 38,381.84
  4. Step 4: Simplify right side
    85,779.28x = 4,938,505,377.48
  5. Step 5: Solve for x
    x = 4,938,505,377.48/85,779.28
  6. Step 6: Final answer
    x = 57,572.24

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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.