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Finding the Fourth Proportional to 1,114.16, 1,671.33 and 420.70

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Solution

The fourth proportional to 1,114.16, 1,671.33 and 420.70 is: 631.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,114.16 : 1,671.33 = 420.70 : x
  2. Step 2: Convert to fraction form
    1,114.16/1,671.33 = 420.70/x
  3. Step 3: Cross multiply
    1,114.16x = 1,671.33 × 420.70
  4. Step 4: Simplify right side
    1,114.16x = 703,130.21
  5. Step 5: Solve for x
    x = 703,130.21/1,114.16
  6. Step 6: Final answer
    x = 631.08

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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.