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Finding the Fourth Proportional to 718,154.61, 991,053.06 and 395,870.10

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Solution

The fourth proportional to 718,154.61, 991,053.06 and 395,870.10 is: 546,300.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,154.61 : 991,053.06 = 395,870.10 : x
  2. Step 2: Convert to fraction form
    718,154.61/991,053.06 = 395,870.10/x
  3. Step 3: Cross multiply
    718,154.61x = 991,053.06 × 395,870.10
  4. Step 4: Simplify right side
    718,154.61x = 392,328,273,967.51
  5. Step 5: Solve for x
    x = 392,328,273,967.51/718,154.61
  6. Step 6: Final answer
    x = 546,300.57

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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.