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Finding the Fourth Proportional to 660,205.60, 990,636.45 and 260,859.40

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Solution

The fourth proportional to 660,205.60, 990,636.45 and 260,859.40 is: 391,418.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,205.60 : 990,636.45 = 260,859.40 : x
  2. Step 2: Convert to fraction form
    660,205.60/990,636.45 = 260,859.40/x
  3. Step 3: Cross multiply
    660,205.60x = 990,636.45 × 260,859.40
  4. Step 4: Simplify right side
    660,205.60x = 258,416,829,965.13
  5. Step 5: Solve for x
    x = 258,416,829,965.13/660,205.60
  6. Step 6: Final answer
    x = 391,418.72

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1.5x scale

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.