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Finding the Fourth Proportional to 1,113.18, 1,670.88 and 651.84

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Solution

The fourth proportional to 1,113.18, 1,670.88 and 651.84 is: 978.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.18 : 1,670.88 = 651.84 : x
  2. Step 2: Convert to fraction form
    1,113.18/1,670.88 = 651.84/x
  3. Step 3: Cross multiply
    1,113.18x = 1,670.88 × 651.84
  4. Step 4: Simplify right side
    1,113.18x = 1,089,146.42
  5. Step 5: Solve for x
    x = 1,089,146.42/1,113.18
  6. Step 6: Final answer
    x = 978.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.