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Finding the Fourth Proportional to 1,280,356,238.72, 1,766,893,402.32 and 693,645,374.72

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Solution

The fourth proportional to 1,280,356,238.72, 1,766,893,402.32 and 693,645,374.72 is: 957,231,588.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280,356,238.72 : 1,766,893,402.32 = 693,645,374.72 : x
  2. Step 2: Convert to fraction form
    1,280,356,238.72/1,766,893,402.32 = 693,645,374.72/x
  3. Step 3: Cross multiply
    1,280,356,238.72x = 1,766,893,402.32 × 693,645,374.72
  4. Step 4: Simplify right side
    1,280,356,238.72x = 1,225,597,436,142,552,064
  5. Step 5: Solve for x
    x = 1,225,597,436,142,552,064/1,280,356,238.72
  6. Step 6: Final answer
    x = 957,231,588.43

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1.5x scale

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.