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Finding the Fourth Proportional to 1,122,368, 1,548,913.92 and 645,440

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Solution

The fourth proportional to 1,122,368, 1,548,913.92 and 645,440 is: 890,733.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122,368 : 1,548,913.92 = 645,440 : x
  2. Step 2: Convert to fraction form
    1,122,368/1,548,913.92 = 645,440/x
  3. Step 3: Cross multiply
    1,122,368x = 1,548,913.92 × 645,440
  4. Step 4: Simplify right side
    1,122,368x = 999,731,000,524.80
  5. Step 5: Solve for x
    x = 999,731,000,524.80/1,122,368
  6. Step 6: Final answer
    x = 890,733.70

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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.