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Finding the Fourth Proportional to 1,187.18, 1,780.59 and 417.50

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Solution

The fourth proportional to 1,187.18, 1,780.59 and 417.50 is: 626.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.18 : 1,780.59 = 417.50 : x
  2. Step 2: Convert to fraction form
    1,187.18/1,780.59 = 417.50/x
  3. Step 3: Cross multiply
    1,187.18x = 1,780.59 × 417.50
  4. Step 4: Simplify right side
    1,187.18x = 743,396.33
  5. Step 5: Solve for x
    x = 743,396.33/1,187.18
  6. Step 6: Final answer
    x = 626.19

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Double scale
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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.