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Finding the Fourth Proportional to 652.79, 901.11 and 390.75

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Solution

The fourth proportional to 652.79, 901.11 and 390.75 is: 539.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    652.79 : 901.11 = 390.75 : x
  2. Step 2: Convert to fraction form
    652.79/901.11 = 390.75/x
  3. Step 3: Cross multiply
    652.79x = 901.11 × 390.75
  4. Step 4: Simplify right side
    652.79x = 352,108.73
  5. Step 5: Solve for x
    x = 352,108.73/652.79
  6. Step 6: Final answer
    x = 539.39

Related Problems

Find fourth proportional to 326.39, 450.56 and 195.38
Half scale
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Double scale
Find fourth proportional to 653.79, 902.49 and 391.75
Similar ratio
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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.