Home / 21,011,989.28-28,992,135.60-12,756,398.40

Finding the Fourth Proportional to 21,011,989.28, 28,992,135.60 and 12,756,398.40

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Solution

The fourth proportional to 21,011,989.28, 28,992,135.60 and 12,756,398.40 is: 17,601,152.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,011,989.28 : 28,992,135.60 = 12,756,398.40 : x
  2. Step 2: Convert to fraction form
    21,011,989.28/28,992,135.60 = 12,756,398.40/x
  3. Step 3: Cross multiply
    21,011,989.28x = 28,992,135.60 × 12,756,398.40
  4. Step 4: Simplify right side
    21,011,989.28x = 369,835,232,180,423.06
  5. Step 5: Solve for x
    x = 369,835,232,180,423.06/21,011,989.28
  6. Step 6: Final answer
    x = 17,601,152.72

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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.