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Finding the Fourth Proportional to 99,978,280.84, 137,909,698.63 and 66,031,047.65

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Solution

The fourth proportional to 99,978,280.84, 137,909,698.63 and 66,031,047.65 is: 91,083,001.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,978,280.84 : 137,909,698.63 = 66,031,047.65 : x
  2. Step 2: Convert to fraction form
    99,978,280.84/137,909,698.63 = 66,031,047.65/x
  3. Step 3: Cross multiply
    99,978,280.84x = 137,909,698.63 × 66,031,047.65
  4. Step 4: Simplify right side
    99,978,280.84x = 9,106,321,881,133,666
  5. Step 5: Solve for x
    x = 9,106,321,881,133,666/99,978,280.84
  6. Step 6: Final answer
    x = 91,083,001.27

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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.