Home / 1,117.40-1,677.45-1,109.30

Finding the Fourth Proportional to 1,117.40, 1,677.45 and 1,109.30

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Solution

The fourth proportional to 1,117.40, 1,677.45 and 1,109.30 is: 1,665.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.40 : 1,677.45 = 1,109.30 : x
  2. Step 2: Convert to fraction form
    1,117.40/1,677.45 = 1,109.30/x
  3. Step 3: Cross multiply
    1,117.40x = 1,677.45 × 1,109.30
  4. Step 4: Simplify right side
    1,117.40x = 1,860,795.29
  5. Step 5: Solve for x
    x = 1,860,795.29/1,117.40
  6. Step 6: Final answer
    x = 1,665.29

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1.5x scale

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.