Home / 13,780.40-19,018.80-7,814.24

Finding the Fourth Proportional to 13,780.40, 19,018.80 and 7,814.24

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Solution

The fourth proportional to 13,780.40, 19,018.80 and 7,814.24 is: 10,784.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,780.40 : 19,018.80 = 7,814.24 : x
  2. Step 2: Convert to fraction form
    13,780.40/19,018.80 = 7,814.24/x
  3. Step 3: Cross multiply
    13,780.40x = 19,018.80 × 7,814.24
  4. Step 4: Simplify right side
    13,780.40x = 148,617,467.71
  5. Step 5: Solve for x
    x = 148,617,467.71/13,780.40
  6. Step 6: Final answer
    x = 10,784.70

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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.