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Finding the Fourth Proportional to 1,210.90, 1,671.13 and 738.75

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Solution

The fourth proportional to 1,210.90, 1,671.13 and 738.75 is: 1,019.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.90 : 1,671.13 = 738.75 : x
  2. Step 2: Convert to fraction form
    1,210.90/1,671.13 = 738.75/x
  3. Step 3: Cross multiply
    1,210.90x = 1,671.13 × 738.75
  4. Step 4: Simplify right side
    1,210.90x = 1,234,547.29
  5. Step 5: Solve for x
    x = 1,234,547.29/1,210.90
  6. Step 6: Final answer
    x = 1,019.53

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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.