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Finding the Fourth Proportional to 1,390,869.95, 1,919,271.44 and 787,257.95

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Solution

The fourth proportional to 1,390,869.95, 1,919,271.44 and 787,257.95 is: 1,086,342.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390,869.95 : 1,919,271.44 = 787,257.95 : x
  2. Step 2: Convert to fraction form
    1,390,869.95/1,919,271.44 = 787,257.95/x
  3. Step 3: Cross multiply
    1,390,869.95x = 1,919,271.44 × 787,257.95
  4. Step 4: Simplify right side
    1,390,869.95x = 1,510,961,691,719.74
  5. Step 5: Solve for x
    x = 1,510,961,691,719.74/1,390,869.95
  6. Step 6: Final answer
    x = 1,086,342.90

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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.