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Finding the Fourth Proportional to 620.76, 856.65 and 358.77

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Solution

The fourth proportional to 620.76, 856.65 and 358.77 is: 495.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.76 : 856.65 = 358.77 : x
  2. Step 2: Convert to fraction form
    620.76/856.65 = 358.77/x
  3. Step 3: Cross multiply
    620.76x = 856.65 × 358.77
  4. Step 4: Simplify right side
    620.76x = 307,336.04
  5. Step 5: Solve for x
    x = 307,336.04/620.76
  6. Step 6: Final answer
    x = 495.10

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Find fourth proportional to 310.38, 428.33 and 179.38
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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.