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Finding the Fourth Proportional to 1,399,964.95, 1,931,989.00 and 788,140.94

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Solution

The fourth proportional to 1,399,964.95, 1,931,989.00 and 788,140.94 is: 1,087,655.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,399,964.95 : 1,931,989.00 = 788,140.94 : x
  2. Step 2: Convert to fraction form
    1,399,964.95/1,931,989.00 = 788,140.94/x
  3. Step 3: Cross multiply
    1,399,964.95x = 1,931,989.00 × 788,140.94
  4. Step 4: Simplify right side
    1,399,964.95x = 1,522,679,616,377.13
  5. Step 5: Solve for x
    x = 1,522,679,616,377.13/1,399,964.95
  6. Step 6: Final answer
    x = 1,087,655.53

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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.