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Finding the Fourth Proportional to 1,114,738.60, 1,672,107.90 and 778,815.40

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Solution

The fourth proportional to 1,114,738.60, 1,672,107.90 and 778,815.40 is: 1,168,223.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,114,738.60 : 1,672,107.90 = 778,815.40 : x
  2. Step 2: Convert to fraction form
    1,114,738.60/1,672,107.90 = 778,815.40/x
  3. Step 3: Cross multiply
    1,114,738.60x = 1,672,107.90 × 778,815.40
  4. Step 4: Simplify right side
    1,114,738.60x = 1,302,263,382,981.66
  5. Step 5: Solve for x
    x = 1,302,263,382,981.66/1,114,738.60
  6. Step 6: Final answer
    x = 1,168,223.10

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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.