Home / 138,459.90-191,075.40-78,031.47

Finding the Fourth Proportional to 138,459.90, 191,075.40 and 78,031.47

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Solution

The fourth proportional to 138,459.90, 191,075.40 and 78,031.47 is: 107,683.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,459.90 : 191,075.40 = 78,031.47 : x
  2. Step 2: Convert to fraction form
    138,459.90/191,075.40 = 78,031.47/x
  3. Step 3: Cross multiply
    138,459.90x = 191,075.40 × 78,031.47
  4. Step 4: Simplify right side
    138,459.90x = 14,909,894,342.84
  5. Step 5: Solve for x
    x = 14,909,894,342.84/138,459.90
  6. Step 6: Final answer
    x = 107,683.84

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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.