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Finding the Fourth Proportional to 551,071.56, 760,478.36 and 309,354.60

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Solution

The fourth proportional to 551,071.56, 760,478.36 and 309,354.60 is: 426,909.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    551,071.56 : 760,478.36 = 309,354.60 : x
  2. Step 2: Convert to fraction form
    551,071.56/760,478.36 = 309,354.60/x
  3. Step 3: Cross multiply
    551,071.56x = 760,478.36 × 309,354.60
  4. Step 4: Simplify right side
    551,071.56x = 235,257,478,866.46
  5. Step 5: Solve for x
    x = 235,257,478,866.46/551,071.56
  6. Step 6: Final answer
    x = 426,909.13

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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.