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Finding the Fourth Proportional to 877.44, 1,210.78 and 499.32

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Solution

The fourth proportional to 877.44, 1,210.78 and 499.32 is: 689.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.44 : 1,210.78 = 499.32 : x
  2. Step 2: Convert to fraction form
    877.44/1,210.78 = 499.32/x
  3. Step 3: Cross multiply
    877.44x = 1,210.78 × 499.32
  4. Step 4: Simplify right side
    877.44x = 604,560.62
  5. Step 5: Solve for x
    x = 604,560.62/877.44
  6. Step 6: Final answer
    x = 689.01

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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.