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Finding the Fourth Proportional to 551,680.40, 761,317.80 and 309,969.20

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Solution

The fourth proportional to 551,680.40, 761,317.80 and 309,969.20 is: 427,756.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    551,680.40 : 761,317.80 = 309,969.20 : x
  2. Step 2: Convert to fraction form
    551,680.40/761,317.80 = 309,969.20/x
  3. Step 3: Cross multiply
    551,680.40x = 761,317.80 × 309,969.20
  4. Step 4: Simplify right side
    551,680.40x = 235,985,069,411.76
  5. Step 5: Solve for x
    x = 235,985,069,411.76/551,680.40
  6. Step 6: Final answer
    x = 427,756.85

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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.