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Finding the Fourth Proportional to 551,697.18, 761,320.91 and 309,989.94

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Solution

The fourth proportional to 551,697.18, 761,320.91 and 309,989.94 is: 427,774.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    551,697.18 : 761,320.91 = 309,989.94 : x
  2. Step 2: Convert to fraction form
    551,697.18/761,320.91 = 309,989.94/x
  3. Step 3: Cross multiply
    551,697.18x = 761,320.91 × 309,989.94
  4. Step 4: Simplify right side
    551,697.18x = 236,001,821,661.70
  5. Step 5: Solve for x
    x = 236,001,821,661.70/551,697.18
  6. Step 6: Final answer
    x = 427,774.20

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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.