Home / 1,145,128.40-1,716,223.80-639,688.40

Finding the Fourth Proportional to 1,145,128.40, 1,716,223.80 and 639,688.40

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Solution

The fourth proportional to 1,145,128.40, 1,716,223.80 and 639,688.40 is: 958,712.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145,128.40 : 1,716,223.80 = 639,688.40 : x
  2. Step 2: Convert to fraction form
    1,145,128.40/1,716,223.80 = 639,688.40/x
  3. Step 3: Cross multiply
    1,145,128.40x = 1,716,223.80 × 639,688.40
  4. Step 4: Simplify right side
    1,145,128.40x = 1,097,848,456,663.92
  5. Step 5: Solve for x
    x = 1,097,848,456,663.92/1,145,128.40
  6. Step 6: Final answer
    x = 958,712.10

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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.