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Finding the Fourth Proportional to 620.76, 856.66 and 358.76

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Solution

The fourth proportional to 620.76, 856.66 and 358.76 is: 495.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.76 : 856.66 = 358.76 : x
  2. Step 2: Convert to fraction form
    620.76/856.66 = 358.76/x
  3. Step 3: Cross multiply
    620.76x = 856.66 × 358.76
  4. Step 4: Simplify right side
    620.76x = 307,335.34
  5. Step 5: Solve for x
    x = 307,335.34/620.76
  6. Step 6: Final answer
    x = 495.10

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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.