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Finding the Fourth Proportional to 555.63, 766.80 and 322.75

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Solution

The fourth proportional to 555.63, 766.80 and 322.75 is: 445.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.63 : 766.80 = 322.75 : x
  2. Step 2: Convert to fraction form
    555.63/766.80 = 322.75/x
  3. Step 3: Cross multiply
    555.63x = 766.80 × 322.75
  4. Step 4: Simplify right side
    555.63x = 247,484.70
  5. Step 5: Solve for x
    x = 247,484.70/555.63
  6. Step 6: Final answer
    x = 445.41

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Find fourth proportional to 277.82, 383.40 and 161.38
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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.