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Finding the Fourth Proportional to 18,688.40, 28,075.80 and 12,856.40

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Solution

The fourth proportional to 18,688.40, 28,075.80 and 12,856.40 is: 19,314.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,688.40 : 28,075.80 = 12,856.40 : x
  2. Step 2: Convert to fraction form
    18,688.40/28,075.80 = 12,856.40/x
  3. Step 3: Cross multiply
    18,688.40x = 28,075.80 × 12,856.40
  4. Step 4: Simplify right side
    18,688.40x = 360,953,715.12
  5. Step 5: Solve for x
    x = 360,953,715.12/18,688.40
  6. Step 6: Final answer
    x = 19,314.32

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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.