Home / 128,904,864.23-177,893,009.47-72,399,567.71

Finding the Fourth Proportional to 128,904,864.23, 177,893,009.47 and 72,399,567.71

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Solution

The fourth proportional to 128,904,864.23, 177,893,009.47 and 72,399,567.71 is: 99,913,816.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,904,864.23 : 177,893,009.47 = 72,399,567.71 : x
  2. Step 2: Convert to fraction form
    128,904,864.23/177,893,009.47 = 72,399,567.71/x
  3. Step 3: Cross multiply
    128,904,864.23x = 177,893,009.47 × 72,399,567.71
  4. Step 4: Simplify right side
    128,904,864.23x = 12,879,376,983,904,702
  5. Step 5: Solve for x
    x = 12,879,376,983,904,702/128,904,864.23
  6. Step 6: Final answer
    x = 99,913,816.76

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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.