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Finding the Fourth Proportional to 1,260,775.32, 1,739,835.60 and 687,815.40

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Solution

The fourth proportional to 1,260,775.32, 1,739,835.60 and 687,815.40 is: 949,166.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,260,775.32 : 1,739,835.60 = 687,815.40 : x
  2. Step 2: Convert to fraction form
    1,260,775.32/1,739,835.60 = 687,815.40/x
  3. Step 3: Cross multiply
    1,260,775.32x = 1,739,835.60 × 687,815.40
  4. Step 4: Simplify right side
    1,260,775.32x = 1,196,685,719,148.24
  5. Step 5: Solve for x
    x = 1,196,685,719,148.24/1,260,775.32
  6. Step 6: Final answer
    x = 949,166.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.