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Finding the Fourth Proportional to 878.53, 1,210.51 and 720.63

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Solution

The fourth proportional to 878.53, 1,210.51 and 720.63 is: 992.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.53 : 1,210.51 = 720.63 : x
  2. Step 2: Convert to fraction form
    878.53/1,210.51 = 720.63/x
  3. Step 3: Cross multiply
    878.53x = 1,210.51 × 720.63
  4. Step 4: Simplify right side
    878.53x = 872,329.82
  5. Step 5: Solve for x
    x = 872,329.82/878.53
  6. Step 6: Final answer
    x = 992.94

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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.