Home / 85,870.11-128,764.26-31,817.19

Finding the Fourth Proportional to 85,870.11, 128,764.26 and 31,817.19

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Solution

The fourth proportional to 85,870.11, 128,764.26 and 31,817.19 is: 47,710.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,870.11 : 128,764.26 = 31,817.19 : x
  2. Step 2: Convert to fraction form
    85,870.11/128,764.26 = 31,817.19/x
  3. Step 3: Cross multiply
    85,870.11x = 128,764.26 × 31,817.19
  4. Step 4: Simplify right side
    85,870.11x = 4,096,916,925.63
  5. Step 5: Solve for x
    x = 4,096,916,925.63/85,870.11
  6. Step 6: Final answer
    x = 47,710.63

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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.