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Finding the Fourth Proportional to 928.75, 1,281.64 and 555.64

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Solution

The fourth proportional to 928.75, 1,281.64 and 555.64 is: 766.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.75 : 1,281.64 = 555.64 : x
  2. Step 2: Convert to fraction form
    928.75/1,281.64 = 555.64/x
  3. Step 3: Cross multiply
    928.75x = 1,281.64 × 555.64
  4. Step 4: Simplify right side
    928.75x = 712,130.45
  5. Step 5: Solve for x
    x = 712,130.45/928.75
  6. Step 6: Final answer
    x = 766.76

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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.