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Finding the Fourth Proportional to 924.19, 1,386.66 and 678.65

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Solution

The fourth proportional to 924.19, 1,386.66 and 678.65 is: 1,018.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    924.19 : 1,386.66 = 678.65 : x
  2. Step 2: Convert to fraction form
    924.19/1,386.66 = 678.65/x
  3. Step 3: Cross multiply
    924.19x = 1,386.66 × 678.65
  4. Step 4: Simplify right side
    924.19x = 941,051.15
  5. Step 5: Solve for x
    x = 941,051.15/924.19
  6. Step 6: Final answer
    x = 1,018.25

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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.