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Finding the Fourth Proportional to 1,166.80, 1,610.20 and 642.82

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Solution

The fourth proportional to 1,166.80, 1,610.20 and 642.82 is: 887.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,166.80 : 1,610.20 = 642.82 : x
  2. Step 2: Convert to fraction form
    1,166.80/1,610.20 = 642.82/x
  3. Step 3: Cross multiply
    1,166.80x = 1,610.20 × 642.82
  4. Step 4: Simplify right side
    1,166.80x = 1,035,068.76
  5. Step 5: Solve for x
    x = 1,035,068.76/1,166.80
  6. Step 6: Final answer
    x = 887.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.