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Finding the Fourth Proportional to 1,318,899.51, 1,819,503.47 and 774,789.86

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Solution

The fourth proportional to 1,318,899.51, 1,819,503.47 and 774,789.86 is: 1,068,870.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318,899.51 : 1,819,503.47 = 774,789.86 : x
  2. Step 2: Convert to fraction form
    1,318,899.51/1,819,503.47 = 774,789.86/x
  3. Step 3: Cross multiply
    1,318,899.51x = 1,819,503.47 × 774,789.86
  4. Step 4: Simplify right side
    1,318,899.51x = 1,409,732,831,773.16
  5. Step 5: Solve for x
    x = 1,409,732,831,773.16/1,318,899.51
  6. Step 6: Final answer
    x = 1,068,870.54

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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.