Home / 390,472,289.40-585,296,641.44-128,088,325.20

Finding the Fourth Proportional to 390,472,289.40, 585,296,641.44 and 128,088,325.20

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Solution

The fourth proportional to 390,472,289.40, 585,296,641.44 and 128,088,325.20 is: 191,997,405.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,472,289.40 : 585,296,641.44 = 128,088,325.20 : x
  2. Step 2: Convert to fraction form
    390,472,289.40/585,296,641.44 = 128,088,325.20/x
  3. Step 3: Cross multiply
    390,472,289.40x = 585,296,641.44 × 128,088,325.20
  4. Step 4: Simplify right side
    390,472,289.40x = 74,969,666,547,234,528
  5. Step 5: Solve for x
    x = 74,969,666,547,234,528/390,472,289.40
  6. Step 6: Final answer
    x = 191,997,405.66

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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.