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Finding the Fourth Proportional to 878.12, 1,210.98 and 670.76

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Solution

The fourth proportional to 878.12, 1,210.98 and 670.76 is: 925.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.12 : 1,210.98 = 670.76 : x
  2. Step 2: Convert to fraction form
    878.12/1,210.98 = 670.76/x
  3. Step 3: Cross multiply
    878.12x = 1,210.98 × 670.76
  4. Step 4: Simplify right side
    878.12x = 812,276.94
  5. Step 5: Solve for x
    x = 812,276.94/878.12
  6. Step 6: Final answer
    x = 925.02

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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.