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Finding the Fourth Proportional to 1,119, 1,678.18 and 469.72

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Solution

The fourth proportional to 1,119, 1,678.18 and 469.72 is: 704.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,119 : 1,678.18 = 469.72 : x
  2. Step 2: Convert to fraction form
    1,119/1,678.18 = 469.72/x
  3. Step 3: Cross multiply
    1,119x = 1,678.18 × 469.72
  4. Step 4: Simplify right side
    1,119x = 788,274.71
  5. Step 5: Solve for x
    x = 788,274.71/1,119
  6. Step 6: Final answer
    x = 704.45

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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.