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Finding the Fourth Proportional to 628,643.71, 867,547.09 and 387,065.65

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Solution

The fourth proportional to 628,643.71, 867,547.09 and 387,065.65 is: 534,162.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    628,643.71 : 867,547.09 = 387,065.65 : x
  2. Step 2: Convert to fraction form
    628,643.71/867,547.09 = 387,065.65/x
  3. Step 3: Cross multiply
    628,643.71x = 867,547.09 × 387,065.65
  4. Step 4: Simplify right side
    628,643.71x = 335,797,678,296.46
  5. Step 5: Solve for x
    x = 335,797,678,296.46/628,643.71
  6. Step 6: Final answer
    x = 534,162.15

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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.