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Finding the Fourth Proportional to 659,405.80, 989,108.70 and 553,117.60

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Solution

The fourth proportional to 659,405.80, 989,108.70 and 553,117.60 is: 829,676.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,405.80 : 989,108.70 = 553,117.60 : x
  2. Step 2: Convert to fraction form
    659,405.80/989,108.70 = 553,117.60/x
  3. Step 3: Cross multiply
    659,405.80x = 989,108.70 × 553,117.60
  4. Step 4: Simplify right side
    659,405.80x = 547,093,430,283.12
  5. Step 5: Solve for x
    x = 547,093,430,283.12/659,405.80
  6. Step 6: Final answer
    x = 829,676.40

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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.