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Finding the Fourth Proportional to 1,989,602.40, 2,985,440.40 and 867,784.80

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Solution

The fourth proportional to 1,989,602.40, 2,985,440.40 and 867,784.80 is: 1,302,129.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989,602.40 : 2,985,440.40 = 867,784.80 : x
  2. Step 2: Convert to fraction form
    1,989,602.40/2,985,440.40 = 867,784.80/x
  3. Step 3: Cross multiply
    1,989,602.40x = 2,985,440.40 × 867,784.80
  4. Step 4: Simplify right side
    1,989,602.40x = 2,590,719,800,425.92
  5. Step 5: Solve for x
    x = 2,590,719,800,425.92/1,989,602.40
  6. Step 6: Final answer
    x = 1,302,129.41

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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.