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Finding the Fourth Proportional to 1,287,850.40, 1,931,775.60 and 989,835.20

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Solution

The fourth proportional to 1,287,850.40, 1,931,775.60 and 989,835.20 is: 1,484,752.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287,850.40 : 1,931,775.60 = 989,835.20 : x
  2. Step 2: Convert to fraction form
    1,287,850.40/1,931,775.60 = 989,835.20/x
  3. Step 3: Cross multiply
    1,287,850.40x = 1,931,775.60 × 989,835.20
  4. Step 4: Simplify right side
    1,287,850.40x = 1,912,139,487,381.12
  5. Step 5: Solve for x
    x = 1,912,139,487,381.12/1,287,850.40
  6. Step 6: Final answer
    x = 1,484,752.80

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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.