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Finding the Fourth Proportional to 555.32, 766.73 and 387.65

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Solution

The fourth proportional to 555.32, 766.73 and 387.65 is: 535.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.32 : 766.73 = 387.65 : x
  2. Step 2: Convert to fraction form
    555.32/766.73 = 387.65/x
  3. Step 3: Cross multiply
    555.32x = 766.73 × 387.65
  4. Step 4: Simplify right side
    555.32x = 297,225.77
  5. Step 5: Solve for x
    x = 297,225.77/555.32
  6. Step 6: Final answer
    x = 535.23

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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.