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Finding the Fourth Proportional to 570,628.64, 855,622.80 and 390,917.12

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Solution

The fourth proportional to 570,628.64, 855,622.80 and 390,917.12 is: 586,156.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    570,628.64 : 855,622.80 = 390,917.12 : x
  2. Step 2: Convert to fraction form
    570,628.64/855,622.80 = 390,917.12/x
  3. Step 3: Cross multiply
    570,628.64x = 855,622.80 × 390,917.12
  4. Step 4: Simplify right side
    570,628.64x = 334,477,600,782.34
  5. Step 5: Solve for x
    x = 334,477,600,782.34/570,628.64
  6. Step 6: Final answer
    x = 586,156.35

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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.