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Finding the Fourth Proportional to 618.75, 853.65 and 370.13

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Solution

The fourth proportional to 618.75, 853.65 and 370.13 is: 510.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.75 : 853.65 = 370.13 : x
  2. Step 2: Convert to fraction form
    618.75/853.65 = 370.13/x
  3. Step 3: Cross multiply
    618.75x = 853.65 × 370.13
  4. Step 4: Simplify right side
    618.75x = 315,957.21
  5. Step 5: Solve for x
    x = 315,957.21/618.75
  6. Step 6: Final answer
    x = 510.64

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Find fourth proportional to 309.38, 426.83 and 185.06
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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.