Home / 21,075.15-29,071.53-13,518.80

Finding the Fourth Proportional to 21,075.15, 29,071.53 and 13,518.80

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Solution

The fourth proportional to 21,075.15, 29,071.53 and 13,518.80 is: 18,648.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,075.15 : 29,071.53 = 13,518.80 : x
  2. Step 2: Convert to fraction form
    21,075.15/29,071.53 = 13,518.80/x
  3. Step 3: Cross multiply
    21,075.15x = 29,071.53 × 13,518.80
  4. Step 4: Simplify right side
    21,075.15x = 393,012,054.41
  5. Step 5: Solve for x
    x = 393,012,054.41/21,075.15
  6. Step 6: Final answer
    x = 18,648.13

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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.