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Finding the Fourth Proportional to 810.98, 1,216.70 and 440.71

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Solution

The fourth proportional to 810.98, 1,216.70 and 440.71 is: 661.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.98 : 1,216.70 = 440.71 : x
  2. Step 2: Convert to fraction form
    810.98/1,216.70 = 440.71/x
  3. Step 3: Cross multiply
    810.98x = 1,216.70 × 440.71
  4. Step 4: Simplify right side
    810.98x = 536,210.74
  5. Step 5: Solve for x
    x = 536,210.74/810.98
  6. Step 6: Final answer
    x = 661.19

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Double scale
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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.