Home / 128,715.48-177,636.24-72,130.50

Finding the Fourth Proportional to 128,715.48, 177,636.24 and 72,130.50

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Solution

The fourth proportional to 128,715.48, 177,636.24 and 72,130.50 is: 99,545.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,715.48 : 177,636.24 = 72,130.50 : x
  2. Step 2: Convert to fraction form
    128,715.48/177,636.24 = 72,130.50/x
  3. Step 3: Cross multiply
    128,715.48x = 177,636.24 × 72,130.50
  4. Step 4: Simplify right side
    128,715.48x = 12,812,990,809.32
  5. Step 5: Solve for x
    x = 12,812,990,809.32/128,715.48
  6. Step 6: Final answer
    x = 99,545.06

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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.