Home / 85,590.40-128,416-38,201.18

Finding the Fourth Proportional to 85,590.40, 128,416 and 38,201.18

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Solution

The fourth proportional to 85,590.40, 128,416 and 38,201.18 is: 57,315.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,590.40 : 128,416 = 38,201.18 : x
  2. Step 2: Convert to fraction form
    85,590.40/128,416 = 38,201.18/x
  3. Step 3: Cross multiply
    85,590.40x = 128,416 × 38,201.18
  4. Step 4: Simplify right side
    85,590.40x = 4,905,642,730.88
  5. Step 5: Solve for x
    x = 4,905,642,730.88/85,590.40
  6. Step 6: Final answer
    x = 57,315.34

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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.