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Finding the Fourth Proportional to 653.17, 901.34 and 391.13

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Solution

The fourth proportional to 653.17, 901.34 and 391.13 is: 539.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.17 : 901.34 = 391.13 : x
  2. Step 2: Convert to fraction form
    653.17/901.34 = 391.13/x
  3. Step 3: Cross multiply
    653.17x = 901.34 × 391.13
  4. Step 4: Simplify right side
    653.17x = 352,541.11
  5. Step 5: Solve for x
    x = 352,541.11/653.17
  6. Step 6: Final answer
    x = 539.74

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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.