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Finding the Fourth Proportional to 1,105.12, 1,656.65 and 693.01

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Solution

The fourth proportional to 1,105.12, 1,656.65 and 693.01 is: 1,038.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,105.12 : 1,656.65 = 693.01 : x
  2. Step 2: Convert to fraction form
    1,105.12/1,656.65 = 693.01/x
  3. Step 3: Cross multiply
    1,105.12x = 1,656.65 × 693.01
  4. Step 4: Simplify right side
    1,105.12x = 1,148,069.50
  5. Step 5: Solve for x
    x = 1,148,069.50/1,105.12
  6. Step 6: Final answer
    x = 1,038.87

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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.