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Finding the Fourth Proportional to 661,544.32, 991,064.36 and 390,862.96

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Solution

The fourth proportional to 661,544.32, 991,064.36 and 390,862.96 is: 585,554.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,544.32 : 991,064.36 = 390,862.96 : x
  2. Step 2: Convert to fraction form
    661,544.32/991,064.36 = 390,862.96/x
  3. Step 3: Cross multiply
    661,544.32x = 991,064.36 × 390,862.96
  4. Step 4: Simplify right side
    661,544.32x = 387,370,349,300.11
  5. Step 5: Solve for x
    x = 387,370,349,300.11/661,544.32
  6. Step 6: Final answer
    x = 585,554.64

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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.