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Finding the Fourth Proportional to 1,118.17, 1,678.35 and 839.55

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Solution

The fourth proportional to 1,118.17, 1,678.35 and 839.55 is: 1,260.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.17 : 1,678.35 = 839.55 : x
  2. Step 2: Convert to fraction form
    1,118.17/1,678.35 = 839.55/x
  3. Step 3: Cross multiply
    1,118.17x = 1,678.35 × 839.55
  4. Step 4: Simplify right side
    1,118.17x = 1,409,068.18
  5. Step 5: Solve for x
    x = 1,409,068.18/1,118.17
  6. Step 6: Final answer
    x = 1,260.16

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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.