Home / 20,970.61-31,455.64-8,490.53

Finding the Fourth Proportional to 20,970.61, 31,455.64 and 8,490.53

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Solution

The fourth proportional to 20,970.61, 31,455.64 and 8,490.53 is: 12,735.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,970.61 : 31,455.64 = 8,490.53 : x
  2. Step 2: Convert to fraction form
    20,970.61/31,455.64 = 8,490.53/x
  3. Step 3: Cross multiply
    20,970.61x = 31,455.64 × 8,490.53
  4. Step 4: Simplify right side
    20,970.61x = 267,075,055.09
  5. Step 5: Solve for x
    x = 267,075,055.09/20,970.61
  6. Step 6: Final answer
    x = 12,735.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.