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Finding the Fourth Proportional to 807.66, 1,210.66 and 313.93

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Solution

The fourth proportional to 807.66, 1,210.66 and 313.93 is: 470.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.66 : 1,210.66 = 313.93 : x
  2. Step 2: Convert to fraction form
    807.66/1,210.66 = 313.93/x
  3. Step 3: Cross multiply
    807.66x = 1,210.66 × 313.93
  4. Step 4: Simplify right side
    807.66x = 380,062.49
  5. Step 5: Solve for x
    x = 380,062.49/807.66
  6. Step 6: Final answer
    x = 470.57

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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.