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Finding the Fourth Proportional to 615.40, 923.11 and 153.18

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Solution

The fourth proportional to 615.40, 923.11 and 153.18 is: 229.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.40 : 923.11 = 153.18 : x
  2. Step 2: Convert to fraction form
    615.40/923.11 = 153.18/x
  3. Step 3: Cross multiply
    615.40x = 923.11 × 153.18
  4. Step 4: Simplify right side
    615.40x = 141,401.61
  5. Step 5: Solve for x
    x = 141,401.61/615.40
  6. Step 6: Final answer
    x = 229.77

Related Problems

Find fourth proportional to 307.70, 461.55 and 76.59
Half scale
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Double scale
Find fourth proportional to 616.40, 924.61 and 154.18
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.