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Finding the Fourth Proportional to 978.77, 1,350.48 and 888.01

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Solution

The fourth proportional to 978.77, 1,350.48 and 888.01 is: 1,225.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.77 : 1,350.48 = 888.01 : x
  2. Step 2: Convert to fraction form
    978.77/1,350.48 = 888.01/x
  3. Step 3: Cross multiply
    978.77x = 1,350.48 × 888.01
  4. Step 4: Simplify right side
    978.77x = 1,199,239.74
  5. Step 5: Solve for x
    x = 1,199,239.74/978.77
  6. Step 6: Final answer
    x = 1,225.25

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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.