Home / 12,688.80-19,005.40-6,438.07

Finding the Fourth Proportional to 12,688.80, 19,005.40 and 6,438.07

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Solution

The fourth proportional to 12,688.80, 19,005.40 and 6,438.07 is: 9,643.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,688.80 : 19,005.40 = 6,438.07 : x
  2. Step 2: Convert to fraction form
    12,688.80/19,005.40 = 6,438.07/x
  3. Step 3: Cross multiply
    12,688.80x = 19,005.40 × 6,438.07
  4. Step 4: Simplify right side
    12,688.80x = 122,358,095.58
  5. Step 5: Solve for x
    x = 122,358,095.58/12,688.80
  6. Step 6: Final answer
    x = 9,643.00

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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.