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Finding the Fourth Proportional to 18,937.53, 28,406.30 and 6,457.64

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Solution

The fourth proportional to 18,937.53, 28,406.30 and 6,457.64 is: 9,686.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,937.53 : 28,406.30 = 6,457.64 : x
  2. Step 2: Convert to fraction form
    18,937.53/28,406.30 = 6,457.64/x
  3. Step 3: Cross multiply
    18,937.53x = 28,406.30 × 6,457.64
  4. Step 4: Simplify right side
    18,937.53x = 183,437,484.81
  5. Step 5: Solve for x
    x = 183,437,484.81/18,937.53
  6. Step 6: Final answer
    x = 9,686.45

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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.