Home / 21,075.70-29,085.31-12,123.20

Finding the Fourth Proportional to 21,075.70, 29,085.31 and 12,123.20

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Solution

The fourth proportional to 21,075.70, 29,085.31 and 12,123.20 is: 16,730.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,075.70 : 29,085.31 = 12,123.20 : x
  2. Step 2: Convert to fraction form
    21,075.70/29,085.31 = 12,123.20/x
  3. Step 3: Cross multiply
    21,075.70x = 29,085.31 × 12,123.20
  4. Step 4: Simplify right side
    21,075.70x = 352,607,030.19
  5. Step 5: Solve for x
    x = 352,607,030.19/21,075.70
  6. Step 6: Final answer
    x = 16,730.50

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1.5x scale

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.