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Finding the Fourth Proportional to 660,438.40, 990,657.60 and 656,291.20

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Solution

The fourth proportional to 660,438.40, 990,657.60 and 656,291.20 is: 984,436.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,438.40 : 990,657.60 = 656,291.20 : x
  2. Step 2: Convert to fraction form
    660,438.40/990,657.60 = 656,291.20/x
  3. Step 3: Cross multiply
    660,438.40x = 990,657.60 × 656,291.20
  4. Step 4: Simplify right side
    660,438.40x = 650,159,865,093.12
  5. Step 5: Solve for x
    x = 650,159,865,093.12/660,438.40
  6. Step 6: Final answer
    x = 984,436.80

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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.