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Finding the Fourth Proportional to 1,125.50, 1,688.43 and 687.02

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Solution

The fourth proportional to 1,125.50, 1,688.43 and 687.02 is: 1,030.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.50 : 1,688.43 = 687.02 : x
  2. Step 2: Convert to fraction form
    1,125.50/1,688.43 = 687.02/x
  3. Step 3: Cross multiply
    1,125.50x = 1,688.43 × 687.02
  4. Step 4: Simplify right side
    1,125.50x = 1,159,985.18
  5. Step 5: Solve for x
    x = 1,159,985.18/1,125.50
  6. Step 6: Final answer
    x = 1,030.64

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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.