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Finding the Fourth Proportional to 661,509.74, 991,015.99 and 390,830.22

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Solution

The fourth proportional to 661,509.74, 991,015.99 and 390,830.22 is: 585,507.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,509.74 : 991,015.99 = 390,830.22 : x
  2. Step 2: Convert to fraction form
    661,509.74/991,015.99 = 390,830.22/x
  3. Step 3: Cross multiply
    661,509.74x = 991,015.99 × 390,830.22
  4. Step 4: Simplify right side
    661,509.74x = 387,318,995,441.07
  5. Step 5: Solve for x
    x = 387,318,995,441.07/661,509.74
  6. Step 6: Final answer
    x = 585,507.62

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.