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Finding the Fourth Proportional to 620.67, 856.54 and 340.91

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Solution

The fourth proportional to 620.67, 856.54 and 340.91 is: 470.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.67 : 856.54 = 340.91 : x
  2. Step 2: Convert to fraction form
    620.67/856.54 = 340.91/x
  3. Step 3: Cross multiply
    620.67x = 856.54 × 340.91
  4. Step 4: Simplify right side
    620.67x = 292,000.48
  5. Step 5: Solve for x
    x = 292,000.48/620.67
  6. Step 6: Final answer
    x = 470.46

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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.