Home / 1,318.16-1,977.20-538.15

Finding the Fourth Proportional to 1,318.16, 1,977.20 and 538.15

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Solution

The fourth proportional to 1,318.16, 1,977.20 and 538.15 is: 807.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.16 : 1,977.20 = 538.15 : x
  2. Step 2: Convert to fraction form
    1,318.16/1,977.20 = 538.15/x
  3. Step 3: Cross multiply
    1,318.16x = 1,977.20 × 538.15
  4. Step 4: Simplify right side
    1,318.16x = 1,064,030.18
  5. Step 5: Solve for x
    x = 1,064,030.18/1,318.16
  6. Step 6: Final answer
    x = 807.21

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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.