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Finding the Fourth Proportional to 1,114.84, 1,538.70 and 642.76

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Solution

The fourth proportional to 1,114.84, 1,538.70 and 642.76 is: 887.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,114.84 : 1,538.70 = 642.76 : x
  2. Step 2: Convert to fraction form
    1,114.84/1,538.70 = 642.76/x
  3. Step 3: Cross multiply
    1,114.84x = 1,538.70 × 642.76
  4. Step 4: Simplify right side
    1,114.84x = 989,014.81
  5. Step 5: Solve for x
    x = 989,014.81/1,114.84
  6. Step 6: Final answer
    x = 887.14

Related Problems

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Half scale
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Double scale
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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.