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Finding the Fourth Proportional to 661,428.40, 989,518.20 and 573,656.80

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Solution

The fourth proportional to 661,428.40, 989,518.20 and 573,656.80 is: 858,209.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,428.40 : 989,518.20 = 573,656.80 : x
  2. Step 2: Convert to fraction form
    661,428.40/989,518.20 = 573,656.80/x
  3. Step 3: Cross multiply
    661,428.40x = 989,518.20 × 573,656.80
  4. Step 4: Simplify right side
    661,428.40x = 567,643,844,153.76
  5. Step 5: Solve for x
    x = 567,643,844,153.76/661,428.40
  6. Step 6: Final answer
    x = 858,209.06

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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.