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Finding the Fourth Proportional to 1,130.31, 1,695.45 and 399.90

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Solution

The fourth proportional to 1,130.31, 1,695.45 and 399.90 is: 599.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,130.31 : 1,695.45 = 399.90 : x
  2. Step 2: Convert to fraction form
    1,130.31/1,695.45 = 399.90/x
  3. Step 3: Cross multiply
    1,130.31x = 1,695.45 × 399.90
  4. Step 4: Simplify right side
    1,130.31x = 678,010.46
  5. Step 5: Solve for x
    x = 678,010.46/1,130.31
  6. Step 6: Final answer
    x = 599.84

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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.