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Finding the Fourth Proportional to 615.34, 848.19 and 490.78

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Solution

The fourth proportional to 615.34, 848.19 and 490.78 is: 676.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.34 : 848.19 = 490.78 : x
  2. Step 2: Convert to fraction form
    615.34/848.19 = 490.78/x
  3. Step 3: Cross multiply
    615.34x = 848.19 × 490.78
  4. Step 4: Simplify right side
    615.34x = 416,274.69
  5. Step 5: Solve for x
    x = 416,274.69/615.34
  6. Step 6: Final answer
    x = 676.50

Related Problems

Find fourth proportional to 307.67, 424.10 and 245.39
Half scale
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Double scale
Find fourth proportional to 616.34, 849.57 and 491.78
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.