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Finding the Fourth Proportional to 661,505.38, 991,009.44 and 390,825.85

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Solution

The fourth proportional to 661,505.38, 991,009.44 and 390,825.85 is: 585,501.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,505.38 : 991,009.44 = 390,825.85 : x
  2. Step 2: Convert to fraction form
    661,505.38/991,009.44 = 390,825.85/x
  3. Step 3: Cross multiply
    661,505.38x = 991,009.44 × 390,825.85
  4. Step 4: Simplify right side
    661,505.38x = 387,312,106,746.02
  5. Step 5: Solve for x
    x = 387,312,106,746.02/661,505.38
  6. Step 6: Final answer
    x = 585,501.07

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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.