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Finding the Fourth Proportional to 620.69, 856.58 and 340.95

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Solution

The fourth proportional to 620.69, 856.58 and 340.95 is: 470.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.69 : 856.58 = 340.95 : x
  2. Step 2: Convert to fraction form
    620.69/856.58 = 340.95/x
  3. Step 3: Cross multiply
    620.69x = 856.58 × 340.95
  4. Step 4: Simplify right side
    620.69x = 292,047.64
  5. Step 5: Solve for x
    x = 292,047.64/620.69
  6. Step 6: Final answer
    x = 470.52

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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.