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Finding the Fourth Proportional to 607.65, 838.65 and 387.13

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Solution

The fourth proportional to 607.65, 838.65 and 387.13 is: 534.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    607.65 : 838.65 = 387.13 : x
  2. Step 2: Convert to fraction form
    607.65/838.65 = 387.13/x
  3. Step 3: Cross multiply
    607.65x = 838.65 × 387.13
  4. Step 4: Simplify right side
    607.65x = 324,667.50
  5. Step 5: Solve for x
    x = 324,667.50/607.65
  6. Step 6: Final answer
    x = 534.30

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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.