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Finding the Fourth Proportional to 628,643.76, 867,547.20 and 387,065.71

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Solution

The fourth proportional to 628,643.76, 867,547.20 and 387,065.71 is: 534,162.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    628,643.76 : 867,547.20 = 387,065.71 : x
  2. Step 2: Convert to fraction form
    628,643.76/867,547.20 = 387,065.71/x
  3. Step 3: Cross multiply
    628,643.76x = 867,547.20 × 387,065.71
  4. Step 4: Simplify right side
    628,643.76x = 335,797,772,926.51
  5. Step 5: Solve for x
    x = 335,797,772,926.51/628,643.76
  6. Step 6: Final answer
    x = 534,162.26

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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.