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Finding the Fourth Proportional to 1,435,059.32, 1,978,255.86 and 918,739.40

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Solution

The fourth proportional to 1,435,059.32, 1,978,255.86 and 918,739.40 is: 1,266,499.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,435,059.32 : 1,978,255.86 = 918,739.40 : x
  2. Step 2: Convert to fraction form
    1,435,059.32/1,978,255.86 = 918,739.40/x
  3. Step 3: Cross multiply
    1,435,059.32x = 1,978,255.86 × 918,739.40
  4. Step 4: Simplify right side
    1,435,059.32x = 1,817,501,601,862.88
  5. Step 5: Solve for x
    x = 1,817,501,601,862.88/1,435,059.32
  6. Step 6: Final answer
    x = 1,266,499.28

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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.