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Finding the Fourth Proportional to 978,916.28, 1,351,152.77 and 668,944.40

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Solution

The fourth proportional to 978,916.28, 1,351,152.77 and 668,944.40 is: 923,312.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,916.28 : 1,351,152.77 = 668,944.40 : x
  2. Step 2: Convert to fraction form
    978,916.28/1,351,152.77 = 668,944.40/x
  3. Step 3: Cross multiply
    978,916.28x = 1,351,152.77 × 668,944.40
  4. Step 4: Simplify right side
    978,916.28x = 903,846,068,935.50
  5. Step 5: Solve for x
    x = 903,846,068,935.50/978,916.28
  6. Step 6: Final answer
    x = 923,312.95

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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.