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Finding the Fourth Proportional to 20,310,978.42, 30,255,366.59 and 19,210,873.68

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Solution

The fourth proportional to 20,310,978.42, 30,255,366.59 and 19,210,873.68 is: 28,616,643.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,310,978.42 : 30,255,366.59 = 19,210,873.68 : x
  2. Step 2: Convert to fraction form
    20,310,978.42/30,255,366.59 = 19,210,873.68/x
  3. Step 3: Cross multiply
    20,310,978.42x = 30,255,366.59 × 19,210,873.68
  4. Step 4: Simplify right side
    20,310,978.42x = 581,232,025,606,528
  5. Step 5: Solve for x
    x = 581,232,025,606,528/20,310,978.42
  6. Step 6: Final answer
    x = 28,616,643.35

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.