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Finding the Fourth Proportional to 660,875.40, 992,090.70 and 656,209.80

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Solution

The fourth proportional to 660,875.40, 992,090.70 and 656,209.80 is: 985,086.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,875.40 : 992,090.70 = 656,209.80 : x
  2. Step 2: Convert to fraction form
    660,875.40/992,090.70 = 656,209.80/x
  3. Step 3: Cross multiply
    660,875.40x = 992,090.70 × 656,209.80
  4. Step 4: Simplify right side
    660,875.40x = 651,019,639,828.86
  5. Step 5: Solve for x
    x = 651,019,639,828.86/660,875.40
  6. Step 6: Final answer
    x = 985,086.81

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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.