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Finding the Fourth Proportional to 660,784.60, 989,864.70 and 393,751.90

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Solution

The fourth proportional to 660,784.60, 989,864.70 and 393,751.90 is: 589,845.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,784.60 : 989,864.70 = 393,751.90 : x
  2. Step 2: Convert to fraction form
    660,784.60/989,864.70 = 393,751.90/x
  3. Step 3: Cross multiply
    660,784.60x = 989,864.70 × 393,751.90
  4. Step 4: Simplify right side
    660,784.60x = 389,761,106,367.93
  5. Step 5: Solve for x
    x = 389,761,106,367.93/660,784.60
  6. Step 6: Final answer
    x = 589,845.93

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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.