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Finding the Fourth Proportional to 945.90, 1,305.45 and 572.76

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Solution

The fourth proportional to 945.90, 1,305.45 and 572.76 is: 790.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.90 : 1,305.45 = 572.76 : x
  2. Step 2: Convert to fraction form
    945.90/1,305.45 = 572.76/x
  3. Step 3: Cross multiply
    945.90x = 1,305.45 × 572.76
  4. Step 4: Simplify right side
    945.90x = 747,709.54
  5. Step 5: Solve for x
    x = 747,709.54/945.90
  6. Step 6: Final answer
    x = 790.47

Related Problems

Find fourth proportional to 472.95, 652.73 and 286.38
Half scale
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Double scale
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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.